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15 December, 03:02

Find the sum of the first 10 terms of the series - 3 + 12-48 + ...,

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  1. 15 December, 03:45
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    R = - 4

    a = - 3

    using ∑n = a (1-rⁿ) / 1-r

    ∑n:10 = - 3 (1 - (-4) ^10) / 1 - (-4)

    = - 3 (1-1,048,576) / 1+4

    = - 3 (-1048575) / 5

    = 3,145,725 / 5

    = 629,145
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